Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden of behavioral disclosure. It only restates the schema's requirement that an idempotency key is mandatory and says nothing about side effects, whether the confirmation triggers processing, reversibility, failure behavior, or what response to expect. The idempotency semantics are implied but not explained.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.